These soldiers were large warriors that wore a specialized type of stormtrooper armor and were trained for front line combat against incredibly powerful enemies such as Wookiees, Trandoshans, and other large species.
They were rare but were almost always found at the front of a vanguard where they provided protection for standard stormtroopers and other ranged weapon specialists.
edit Equipment

Quoting Cody Carrigan
Well, they might not be hard for you, because you play on the wii, I play it on PS2.

Well, they are a little annoying sometimes because you think they're dead and then they're not. But even for PS2, they should be easy. All you need is maxed out force powers and the amplified lightsaber damage crystal. All of which I have. How many holocrons do you have in that game? I have 158 and 6 lightsaber hilts.

Quoting Cody Carrigan
That looks really good. Yeah those guys are a pain. I like to like to lightning push them (electrocute them then force push them and they blow up when they touch something) BTW, where did you get the body?

I got the body from an old V-wing set. And these guys really, aren't a HUGE pain. All I do is go crazy with the Wii remote and before you know it, their done.

That looks really good. Yeah those guys are a pain. I like to like to lightning push them (electrocute them then force push them and they blow up when they touch something) BTW, where did you get the body?

Quoting Recon Commander: Commander Reek
Ugh... I hate those guys. I usually either impale them multiple times or bash them into other troopers.

Me too. I like to lighting push them! You know, combine lighting with a push so they go flying and then BLOW UP when they hit the wall? XD I might make an imperial Jet trooper next. I hate them even more. I throw my saber at them and then smash em' into a wall.